Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b8fb0bc83fffea…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 16:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e3b17e9b0f1c39d53f6ddf2113600f7 SHA-1: 64ec518d3b89913589f57554a90e1e2769f717f2 SHA-256: 18b8fb0bc83fffeaa3345a12332dfb95fc4dd1f59377b4b19faa0d4ce1a1e796
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable domains and are structured as a link farm. This suggests an attempt to distribute or redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ajtoablakcentrum.com/_user/file/78856701964.pdf In PDF document text
    • http://zuszdounky.cz/files/xobuluwugokogigisape.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/57252624410.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/74911803339.pdfIn PDF document text
    • http://guowangcable.com/d/files/83056127318.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/96028810848.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fifimagaga.pdfIn PDF document text
    • http://e-hematologica.com/users/file/51911194391.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/14897649764.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/molavanufudosuzekaze.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/3031154.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/84720207065.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/2992529579.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kitozegujidaz.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/38329661385.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/wezija.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/wapovixujimikamatip.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351f79c7874---tatoxagefaxum.pdfIn PDF document text
    • https://premium-house.uz/images/file/tiwumo.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/82462751265.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/62834586135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=zepeto+app+downloadPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/mexaviwivowosopazo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 18052 bytes
SHA-256: c0fed92905ebb151ab56e65e8a13792cfd25c4c72cbc5cfb71e7b4d840833179
font_01_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 10076 bytes
SHA-256: 62589a134077ef354b77cf26afa7962b972180ee1abe5f99610308088543a7f0
font_02_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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